Charles Ray\'s sculpture The Boy with a Frog stands on the very tip of the Punta della Dogana in Venice while a large cruise ship passes through the Grand Canal. Heavy traffic of these large ships is believed to cause deterioration of the biodiversity of the lagoon, because large ships displace a lot of water, cause waves that affect salt marshes as well as buildings in the city, but also displace the soil on the bottom which in turn deepens the lagoon and carries away the important organisms that make the lagoon ecosystem.